咦

yí = y + Ø2

expression of surprise

咦 character breakdown

咦
- 口
- 夷
  - 大
    - 一
    - 人
      - 丿
      - ㇏
  - 弓

kǒu = k + ou3

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

Mnemonic symbol: 口 shall be represented by a mandarin. Karl Marx (k-) is enjoying a mandarin in the outhouse's living room (ou3).

夷

yí = y + Ø2

non-Han people, esp. to the East of China / barbarians / to wipe out / to exterminate / to tear down / to raze

夷 = 大 + 弓 : The barbarians (夷) are about to hijack the space station! Just inside the entrance Maud Younger (y) and the robot (大) will fight until their death to defend the space station. The robot even has a small composite bow (弓) in his robot hands.